High-entropy alloy coating and preparation method and use thereof

A preparation method of a high-entropy alloy (HEA) coating, comprising:

• conducting laser cladding with an HEA powder to obtain the HEA coating;
• wherein the HEA is a FeCoCrNiAl0.5Ti0.5 alloy, and the HEA comprises the following chemical components in atomic percentage:
• Al:
• 10.01% to 12.30%, Co:
• 18.1% to 22.5%, Cr:
• 18.05% to 20.12%, Fe:
• 18.77% to 21.02%, Ni:
• 19.21% to 20.99%, and Ti:
• 8.43% to 11.5%;
• the laser cladding is conducted with a laser power of 1,800 W to 2,400 W, a scanning speed of 300 mm/min to 800 mm/min, an overlap rate of 50% to 70%, and a powder feeding speed of 4 rpm to 6 rpm;
• the HEA powder suitable for the laser cladding has a particle size of 90 μm to 108 μm;
• and
• the HEA powder is fabricated through the following steps:
• forging a consumable electrode rod from raw materials, melting a surface of the consumable electrode rod with a plasma gun, while spinning the rod under an action of high-speed rotary centrifugation to obtain tiny droplets, cooling the tiny droplets into a spherical powder, and collecting to acquire the HEA powder, wherein the plasma gun is used for melting with a flame temperature of the plasma gun maintained at 1,650° ° C. or higher.